Question
Answer
$$a+a^2+4a^2-5a-a^2+9a+8a^2-a=12a^2+4a$$
Explanation
| $$ \begin{aligned}a+a^2+4a^2-5a-a^2+9a+8a^2-a& \xlongequal{ } \cancel{a}+ \cancel{a^2}+4a^2-5a -\cancel{a^2}+9a+8a^2 -\cancel{a} \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}12a^2+4a\end{aligned} $$ | |
| ① | Combine like terms: $$ \, \color{blue}{ \cancel{a}} \,+ \, \color{green}{ \cancel{a^2}} \,+ \color{blue}{4a^2} \color{red}{-5a} \, \color{green}{ -\cancel{a^2}} \,+ \color{orange}{9a} + \color{green}{8a^2} \, \color{orange}{ -\cancel{a}} \, = \color{green}{12a^2} + \color{orange}{4a} $$ |
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